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Product Description:The CM-311A is the latest version of the Crowns proprietary Differoid technology. Differoid stands for differential cardioid. Its cardioid pickup pattern rejects sounds from the rear such as floor monitors. Its noise-cancelling ability also rejects sounds at a distance such as instruments on stage and crowd noise. This results in the CROWN CM-311 having outstanding gain-before-feedback and isolation. Controlled field tests showed that the Differoid provides up to 12 dB more gain before feedback than conventional cardioid microphones. Many users of the Differoid say that their house mix is better because the mics isolation is nearly complete. Designed for touring and live-sound applications the Crown CM-311A is a rugged head-worn microphone with unequalled performance. It sounds like the best handheld microphones full clear and distortion-free even with the loudest singers. Lightweight and comfortable the mics headband and boom adjust to fit any singer. An included pop filter greatly reduces breath noise and pops. Because of the booms unique behind-the-ear design it does not cover up the singers face.